During the cholore incursion, we planet failsafe bombs and nukes under the ground, deep in the mantle, where none could find them. We detonate them, obliterating tens of billions of 'nors at once, and nearly destroying the surface of cholore. We declare open war on the order and tyranors, stating simply: "Their time is up"
No art too lazy We do this before leaving, to give our former friends an edge.